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eight   Hammond Electrical Alarm Clock The Hammond clock employs a completely various kind of synchronous motor, but The essential principle is the exact same.  We need to take the very same measurements, and run a similar Preliminary test course of action to determine the ideal quantity of turns.

At times, the movement may very well be secured with glue. If that's the case, gently pry the motion from the back again with the clock using a screwdriver.

Also take into account that the dial might or might not Possess a wood backing to it. Which has a wood backing the clock dial or encounter will be thicker and therefore would want a longer post.

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It truly is worthy of stating which the resistance brings about a voltage fall within the winding, and this will cause many the heating result.  It does another thing way too - it cuts down the usable voltage within the coil.  Whilst a measurement demonstrates that there is 16V placed on the coil, Practically three.

  It's fully achievable that if an previous clock did induce a fireplace, one's insurance plan plan may very well be cancelled since the supply of the fireplace (the clock) wasn't compliant with any latest electrical equipment standards.  This is especially correct from the US, exactly where UL registration (or deficiency thereof) is taken pretty severely by insurance plan companies.

The 'motor' itself is just the coil, magnetic pole-parts and terminals, and it absolutely was quite clear when using it apart that doing this was never 9roenc LLC expected.  Must the coil fail, the entire Bakelite coil housing would've been replaced.  The mains cable is terminated via the screw terminals, and no type of cable pressure relief exists (or at any time existed as around as I'm able to convey to) any place inside the case.

Beware!  This needs you to generate perhaps lethal connections, and all connections have to be insulated to avoid accidental Get in touch with.  A diagram showing ways to take the measurement is demonstrated previously mentioned.

  You will find there's little complication, in which the Hammond works by using the stray AC magnetic discipline to work the alarm buzzer, but This could not have an effect on the final consequence.

  An overall wrap of black tape finishes off the coil, which was first soaked in varnish, then drained and baked at all around a hundred°C for a number of hrs.  The completed small voltage Telechron motor is demonstrated under.

  The three clock motors that were rewound and calculated show that current is about 300mA on ordinary.

  Most of all, We have now some details about the conventional working situations of the motor.  Many of the applied latest is also became function (turning the motor), And so the nameplate ranking of 2W is probably rather exact.  Not all is going to be, instead of all synchronous clocks also have a nameplate.